| Popis: |
U gornjokrednom i paleocenskom dijelu slijeda uvale Likva nalazi se nekoliko dobro očuvanih razina koraljno-stromatoporoidnih grebena. Unutar grebena uočeni su različiti trošni ostaci koji se morfološki mogu grupirati u dvije skupine. Prva skupina predstavlja domaste forme sa strukturama nalik „prstima“ koji najvjerojatnije pripadaju koraljima, a druga skupina su nepravilne i kuglaste forme koje se nalaze oko domastih formi ili zasebno i vjerojatno pripadaju spužvama (najvjerojatnije stromatoporoidima). Prilikom terenskog istraživanja u listopadu 2020. godine, detaljno su istražene dvije grebenske razine unutar slijeda Likva: jedna unutar mastrihtskog i jedna unutar paleocenskog dijela slijeda. Novo prikupljeni uzorci, kao i oni prikupljeni na ranijim istraživanjima, korišteni su za paleontološke i sedimentološke analize. Analiza mikroskopskih izbrusaka omogućila je određivanje i interpretaciju dijagenetskih i mikrofacijesnih značajki karbonatnih stijena. Ostaci organizama i sediment pronađeni u obje grebenske razine su slični, što govori u prilog relativno brzom uspostavljanju povoljnih uvjeta za razvoj istih nakon izumiranja na kraju krede. In the Upper Cretaceous and Palaeocene part of the Likva Cove section, there are several well-preserved levels of coral-stromatoporoid reefs. Within the reefs, various weathered remains have been observed and morphologically grouped in two groups. The first group represents domal forms with „finger-like“ structures which most likely belong to corals, and the second group represents irregular and bulbous forms which are found around the domal forms and likely belong to sponges (probably stromatoporoids). During field research in October 2020, two reef levels within the Likva section were investigated in detail: one reef from the Maastrichtian and one from the Palaeocene part of the section. Newly taken samples, as well as samples collected from previous investigations, were used for palaeontological and sedimentological analyses. Analysis of microscopic thin sections enabled the determinations and interpretations of diagenetic and microfacies characteristics of carbonate rocks. The remains of organisms and sediment found in both patch reef levels are similar, which implies of the relatively rapid establishment of favourable conditions for their development after the extinction at the end of the Cretaceous. |
